Tablet computer case and associated methods

ABSTRACT

Tablet computer cases and associated methods are disclosed and described. In one embodiment, a tablet computer case may include a first panel configured to releasably engage and hold a tablet computer of a predetermined size and shape, a second panel having a keyboard a hinge rotatably attaching the two panels, and a communication connector that allows the keyboard to communicate with the tablet computer.

PRIORITY DATA

This application is a continuation of U.S. patent application Ser. No.13/097,043, filed on Apr. 28, 2011, which claims the benefit of U.S.Provisional Patent Application Ser. Nos. 61/328,984 and 61/422,621 filedon Apr. 28, 2010 and Dec. 13, 2010 respectively, and is also acontinuation-in-part of U.S. patent application Ser. No. 13/016,830,filed on Jan. 28, 2011, which claims the benefit of U.S. ProvisionalApplication Ser. No. 61/298,974 filed on Jan. 28, 2010, each of whichare incorporated herein by reference.

FIELD OF THE INVENTION

The present invention relates to cases for tablet computing devices andrelated methods. Accordingly, the present invention involves the fieldsof electronics, material science, and mechanical engineering.

BACKGROUND OF THE INVENTION

Tablet computers such as Personal Digital Assistants (PDA), cellularphones, and the computing device recently released by Apple Corporationunder the trade name IPAD® have become increasingly popular. The simpleand slim form factor of such devices is one reason. Another reason isthat many of such devices come with a touch sensitive screen, or “touchscreen” where user input and computing control are engaged by simplytouching the digital display screen. One pioneering example is thecellular phone marketed by Apple under the trade name IPHONE®. Thisphone has a touch screen that allows navigation of computing function,such as internet navigation, program engagement, and communication (i.e.placement of calls, generation of e-mail, and creation of textmessaging) all by directly touching the screen or visual interface.

Direct screen touch navigation has been met with tremendous success inthe marketplace because of the ease of navigation and the absence ofnavigation hardware that is often bulky, difficult or unnatural to use,and often fragile. While direct screen touch navigation overcomes theseissues, it is not ideal for some functions such as text input.Particularly, most tablet devices do not allow the user to input textwith a full sized or nearly full sized QWERTY keyboard or other formatkeyboard for full typing capacity with both hands. Neither would thetouch sensitive display provide sufficient responsiveness to accommodatenormal typing even if size were not an issue. Further, many peoplesimply prefer the feel and performance of hardware based text and datainput, such as a slide out keyboard on a cell phone to the feel andperformance of text input on a touch screen. Finally, the slim andcompact form factor of such devices often trades battery life and memorysize for the small and thin overall design.

BRIEF DESCRIPTION OF FIGURES

FIG. 1 is a front perspective view of a tablet computer case in an openposition in accordance with one embodiment of the present invention.

FIG. 2 is a front perspective view of a tablet computer case in an openposition with a tablet computer held therein in accordance with oneembodiment of the present invention.

FIG. 3 is a front perspective view of a tablet computer case in an openposition in accordance with one embodiment of the present invention.

FIG. 4 is a front perspective view of a tablet computer case in an openposition in spatial relation with a separate panel piece in accordancewith one embodiment of the present invention.

FIG. 5 is a front perspective view of two separated panel pieces inaccordance with one embodiment of the present invention.

FIG. 6 is a front perspective view of a tablet computer case in an openposition in accordance with an embodiment of the present invention,showing delineated areas of the keyboard panel.

FIG. 7 is a transparent perspective view of a tablet computer case in anopen position, showing components therein in accordance with anembodiment of the present invention.

FIG. 8 is a transparent top view of a keyboard panel of a tabletcomputer case showing components therein in accordance with anembodiment of the present invention.

FIGS. 9 through 14 are side cross-section views of a tablet computercase in accordance with the present invention, showing successive panelpositions achieved by actuation of the hinge.

FIGS. 15 and 16 are side cross-section views of the hinge of a tabletcomputer case in accordance with an embodiment of the present invention,showing two stages of opening said tablet computer case from a closedposition to a laptop position.

FIGS. 17 and 18 are side views of the hinge of a tablet computer case inaccordance with an embodiment of the present invention, showing twostages of opening said tablet computer case from a closed position to alaptop position.

DETAILED DESCRIPTION OF THE INVENTION

Before the present invention is disclosed and described, it is to beunderstood that this invention is not limited to the particularstructures, process steps, or materials disclosed herein, but isextended to equivalents thereof as would be recognized by thoseordinarily skilled in the relevant arts. It should also be understoodthat terminology employed herein is used for the purpose of describingparticular embodiments only and is not intended to be limiting.

It must be noted that, as used in this specification and the appendedclaims, the singular forms “a,” “an,” and “the” include plural referentsunless the context clearly dictates otherwise. Thus, for example,reference to “the hinge” includes one or more of such hinges, andreference to “a port” includes reference to one or more of such ports.

Definitions

In describing and claiming the present invention, the followingterminology will be used in accordance with the definitions set forthbelow.

As used herein, the term “tablet computer” refers to any single piececomputing device having a visual output or screen on one side of asubstantially flat or planar casing, inside of which, the entirecomputing device (i.e. all computing components) is substantiallycontained.

As used herein, the term “communication connector” refers to any deviceor mechanism that allows input or output communication, or both, with acomputing device. Examples of communication connectors include I/Oports, cords, wires, cables, lines, connections, etc., as well aswireless connectors such as WiFi, Bluetooth, infrared, and the like.

As used herein with respect to spatial orientation of an object, theterm “portrait” refers to an orientation wherein a top to bottom heightof the object greater than a side to side width of the object, and theterm “landscape” refers to an orientation wherein a side to side widthof an object is more than a top to bottom height of an object. Theseterms are well known in the art.

As used herein, the term “fascia” refers to any portion of a panel thatoverlaps and contacts a visual output side of a tablet computer.Typically fascia will lie flat against the visual output side of thetablet computer and extend along the outer periphery thereof to form apartial frame or a full frame of the visual output side. In one example,a fascia will at least partially overlie a bezel that surrounds thevisual display of a tablet computer. Such a design aids in retaining thetablet computer in the panel as a whole, while allowing a user to viewthe visual output screen and to interact with the computer using thetouch navigation interface.

As used herein, the term “substantially” refers to the complete ornearly complete extent or degree of an action, characteristic, property,state, structure, item, or result. For example, an object that is“substantially” enclosed would mean that the object is either completelyenclosed or nearly completely enclosed. The exact allowable degree ofdeviation from absolute completeness may in some cases depend on thespecific context. However, generally speaking the nearness of completionwill be so as to have the same overall result as if absolute and totalcompletion were obtained. The use of “substantially” is equallyapplicable when used in a negative connotation to refer to the completeor near complete lack of an action, characteristic, property, state,structure, item, or result. For example, a composition that is“substantially free o” particles would either completely lack particles,or so nearly completely lack particles that the effect would be the sameas if it completely lacked particles. In other words, a composition thatis “substantially free of” an ingredient or element may still actuallycontain such item as long as there is no measurable effect thereof.

As used herein, the term “about” is used to provide flexibility to anumerical range endpoint by providing that a given value may be “alittle above” or “a little below” the endpoint. While the term “about”may not be expressly stated in reference to each and every numericalvalue mentioned herein, it is intended that this modifier apply to eachand every numerical value mentioned unless otherwise stated.

As used herein, a plurality of items, structural elements, compositionalelements, and/or materials may be presented in a common list forconvenience. However, these lists should be construed as though eachmember of the list is individually identified as a separate and uniquemember. Thus, no individual member of such list should be construed as ade facto equivalent of any other member of the same list solely based ontheir presentation in a common group without indications to thecontrary.

Dimensions, amounts, and other numerical data may be expressed orpresented herein in a range format. It is to be understood that such arange format is used merely for convenience and brevity and thus shouldbe interpreted flexibly to include not only the numerical valuesexplicitly recited as the limits of the range, but also to include allthe individual numerical values or sub-ranges encompassed within thatrange as if each numerical value and sub-range is explicitly recited. Asan illustration, a numerical range of “about 1 to about 5” should beinterpreted to include not only the explicitly recited values of about 1to about 5, but also include individual values and sub-ranges within theindicated range. Thus, included in this numerical range are individualvalues such as 2, 3, and 4 and sub-ranges such as from 1-3, from 2-4,and from 3-5, etc., as well as 1, 2, 3, 4, and 5, individually. Thissame principle applies to ranges reciting only one numerical value as aminimum or a maximum. Furthermore, such an interpretation should applyregardless of the breadth of the range or the characteristics beingdescribed.

Invention

The present invention provides a tablet computer case and methods forthe use thereof. In one aspect, such a case may include components thatexpand the capacity and input options of the tablet computer. Generallyspeaking, the tablet computer case may include a first panel (alsoreferred to as a “tablet panel”) configured to releasably engage andhold a tablet computer of a predetermined size and shape, a second panel(also referred to as a “keyboard panel”) having a keyboard, a hingerotatably attaching the two panels, and a communication connector thatallows the keyboard to communicate with the tablet computer.

The first panel of the case, in some embodiments, is configured toreleasably engage and hold a tablet computer. In one aspect, the tablecomputer can be held in the panel by a friction fit that prevents thetablet computer from unintentionally disengaging the first panel. In oneembodiment, the first panel can have a back member with an overall shapethat matches the shape of the back of the tablet computer. As such, theback of the first panel can contact and form fit to the back of thetablet computer when the tablet computer is engaged in the first panel.

Referring now to FIG. 1, according to an embodiment the tablet computercase 100 may include a tablet panel 10 configured to releasably engageand hold a tablet computer 12 of a predetermined size and shape, and akeyboard panel 14 having a keyboard side 16 on which a keyboard 18 islocated. A hinge (not shown) rotatably attaches the two panels, andallows the two panels to swing or rotate about the hinge and relative toeach other. When a tablet computer is fit into the tablet panel, thekeyboard communicates with the tablet computer and is able to providetext input and optionally control other functions.

Referring again to FIG. 1, in some aspects of the invention, the tabletpanel 10 can have a hollowed out bed 20 defined by a recessed backsurface 22 and at least one raised side edge 24 extending along, and insome aspects around, the recessed back surface. Such a side edge canform a continuous or discontinuous perimeter around the back surface asfurther discussed herein.

In some embodiments, the side edge 24 may have an internal shape and/orsize substantially matching, or corresponding to, a shape and size of anexternal edge 26 of the tablet computer 12, which is to be held in thehollowed out bed 20. In some aspects, the internal shape and/or size maymatch along at least one external edge of the tablet computer. Inanother aspect, the internal shape and/or size may match along at leasttwo external edges of the tablet computer. In a further aspect, theinternal shape and/or size may match along at least three external edgesof the tablet computer. In yet another aspect, the internal shape and/orsize may match along four external edges of the tablet computer. In yetanother aspect, the internal shape/size match may extend along, theentire, or substantially the entire external perimeter of the tabletcomputer. As the shape and size of tablet computer perimeters can vary,so can the shape and size of the perimeter vary. In some aspects, theshape may be a polygon. In another aspect, the shape may be aquadrilateral. In yet another aspect, the shape may be substantiallysquare. In a further aspect, the shape may be substantially rectangular.Furthermore, while the corners of the hollowed out bed may be sharp witha vertex, in some aspects, the corners may be rounded. In one aspect, atleast one corner may be rounded. In another aspect, two corners may berounded. In a further aspect, all corners may be rounded. In oneembodiment, the shape of the hollowed out bed may have a shape and sizesubstantially matching a shape and size of an iPad® brand tabletcomputer. In some embodiments, the tablet computer held in the hollowedout bed may be an iPad® brand tablet computer.

As also shown in FIG. 1, the raised side edge 24 of the hollowed out bedmay in some aspects, have a flat inwardly facing surface 26. In someembodiments of the present invention, the flat inwardly facing surfacemay have a plane that intersects a plane in which the recessed backsurface 22 resides. In one embodiment, the plane of the flat inwardlyfacing surface on the raised edge may intersect a plane in which therecessed back surface resides at an angle of from about 70 degrees toabout 110 degrees. In yet another embodiment, the angle of intersectionmay be from about 80 degrees to about 90 degrees. In a furtherembodiment, the angle of intersection may be about 90 degrees. In someembodiments of the invention, the flat inwardly facing surface of theraised side edge may abut an external edge 26 of the tablet computer 12when the tablet computer is fit into place and held in the hollowed outbed 20. In some aspects, the external edge of the tablet computer mayinclude a flat outwardly facing surface 30. In another aspect, the edgemay have a rounded, arcuate, or curved shape. In another aspect, theshape of the edge may be pointed or have a ridge or vertex. In someaspects, the abutment of an external edge of the tablet with the flatinwardly facing surface of a raised side edge may aid in holding thetablet computer in place in the hollowed out bed. In some aspects,abutment of opposing flat edges may further increase the hold of thetablet computer by the tablet panel. For example a friction fit canexist between the flat inwardly facing surface and the external edge ofthe tablet computer. In yet other aspects, aspects, the abutment of theflat inwardly facing surface and the external edge of the tabletcomputer may extend along at least one raised side. In another aspect,the abutment of the flat inwardly facing surface and the external edgeof the tablet computer may extend along at least two sides of the raisedside edge. In a further aspect, the abutment of the flat inwardly facingsurface and the external edge of the tablet computer may extend along atleast three sides of the raised side edge. In yet a further aspect, theabutment of the flat inwardly facing surface and the external edge ofthe tablet computer may extend along all sides of the raised side edge.In yet another aspect, the abutment of the flat inwardly facing surfacesand the external edge of the tablet computer may extend along thecorners of the perimeter of the hollowed out bed. In an additionalaspect, the abutment of the flat inwardly facing surface and theexternal edge of the tablet computer may extend along substantially theentire perimeter, whether continuous or discontinuous. In oneembodiment, the raised side edge may bound, surround, or frame,substantially the entire hollowed out bed and have a substantially flatinwardly facing surface along substantially the entire length thereof.Furthermore, in some aspects, the abutment of the flat inwardly facingsurfaces and the external edge of the tablet computer may extend alongsubstantially the entire perimeter bounding, surrounding, or framingsubstantially the entire hollowed out bed.

In some embodiments, the raised side edge may also have a top surface 32and a height 34 to which it extends above the recessed back surface. Insome aspects, the height of the raised side edge may contribute to, ordefine, a depth of the hollowed out bed 20. In some aspects, the depthof the hollowed out bed may substantially match the thickness of thetablet computer.

In a different example, a difference may exist between the thickness ofthe tablet computer and the depth of the hollowed out bed. In someaspects, an insert having a thickness about equal to that difference canbe placed between the tablet and the back surface so that the front ofthe tablet computer is in substantially the same plane with the topsurface of the raised side edge. In another aspect, a difference mayexist between a width or length of the tablet computer and a width orlength of the hollowed out bed. In such aspect, an adapter piece can beconfigured having an external width and length that matches thedimensions of the hollowed out bed, and further including an internalcompartment having dimensions that match the tablet computer and beingmade to engage and hold the tablet computer. The tablet computer can beplaced inside the adapter, and the adapter with the computer heldtherein can be inserted into the hollowed out bed and held securely insaid bed.

Referring now to FIG. 2, a tablet computer 12 is shown being held in thehollowed out bed (not shown) of a tablet panel 10. The tablet panel hasa raised side edge 24 extending around a recessed back surface (notshown). The raised side edge has a top surface 32. The depth of thehollowed out bed substantially matches the thickness of the tabletcomputer so that the screen 36 of the tablet computer is insubstantially the same plane with the top surface of the raised sideedge. However, in some aspects, the depth of the hollowed out bed andthe thickness of the tablet computer may be different. In one aspect,the top surface of the perimeter edge may extend above the screen of thetablet computer when the tablet computer is fit into the hollowed outbed. In another aspect, the screen of the tablet computer may extendabove the top surface of the perimeter edge when the tablet is fit intothe hollowed out bed. Such embodiments and others allow the screen ofthe tablet computer to be readily exposed for use by a user. In someaspects, the entire screen of the tablet computer, or substantially theentire screen may be exposed, or fully exposed, when the tablet computeris engaged in the hollowed out bed of the tablet panel. In anotheraspect, substantially the entire screen and a bezel 38 of the tabletcomputer may be exposed. In yet another aspect, a front surface of acasing edge 40 of a tablet computer may be substantially exposed. In afurther embodiment, the front surface of the casing edge of a tabletcomputer may be substantially exposed, or entirely exposed, along twoopposing ends of the tablet computer.

Regarding the recessed back surface 22 of the hollowed out bed 20, anyshape, configuration, or texture conducive to the engagement of a tabletcomputer into the hollowed out bed may be used. However, in one aspect,the recessed back surface may be solid, or unbroken, at all pointswithin the perimeter edge. In another aspect, it may be broken or haveone or more windows or openings therein as required to achieve aspecific effect or result.

Referring now to FIG. 3, in one embodiment, the back 22 of the firstpanel 10 can have an opening 42 or a window that allows display of alogo or other information contained on the back of the tablet computer.In different aspects, an area of the back or the entire back of thepanel may be clear or at least translucent so as to allow viewing of anywords or logos on the back of the tablet computer. Moreover, the back ofthe first panel can have other spaces or openings that allow a user tocontact the tablet computer for insertion into and removal from thefirst panel. In an aspect, the size of the opening can be selected toaffect the amount of material used by the case, the total weight of thecase, or other characteristics of the case. For example, a largeropening can be included in the back of the first panel to provide a casehaving a lower total weight.

As discussed herein, the first panel may have one or more perimeteredges connected to the back panel and which also abut or otherwiseengage a corresponding side or edge of the tablet computer when thecomputer is inserted into the first panel. In one embodiment, the firstpanel may have one, two, or three perimeter edges. In yet anotherembodiment, the first panel may have four perimeter edges. In theinstance where less than four perimeter edges are present, at least onemissing edge may create an opening to allow for insertion of the tabletcomputer into the first panel. In such embodiment, the tablet computerwill directionally slide into the first panel. In one example of such anembodiment, shown in FIG. 4, the first panel 10 has three perimeteredges 24, between two of which is an open edge 44 through which a tabletcomputer can be slidably inserted into the first panel. As also shown inFIG. 4, it is additionally possible, but not essential, to provide aseparate panel piece 46 configured to attach to the first panel. Thefirst panel and/or the separate panel piece can include structuralfeatures that facilitate secure attachment. For example, as shown inFIGS. 4 and 5, the separate panel piece can include a protrusion 48shaped so as to engage a corresponding recess 50 on the first panel, orvice versa. In an aspect, as shown in FIG. 5, the separate panel pieceand the first panel can each have one protrusion and one recess, eachpositioned so as to engage a complementary feature on the other piece.In addition, the separate panel piece can friction fit around an exposedportion of the tablet computer so as to provide the visual effect of afull panel. Such a two piece first panel may be used to provide acombination of desired aesthetics and functionality.

In an additional embodiment where four side edges are present, thetablet computer may snap or push into the first panel through an openfront and be retained therein through a friction fit or other mechanicalmechanism, such as a fascia that is subsequently connected to the firstpanel, or integral therewith. In the case of the latter, the fascia maybe very narrow and only sufficient to aid in retaining the tabletcomputer in the first panel.

The front of the first panel may in some aspects include a viewingwindow through which the screen of the tablet computer may be viewed. Insome embodiments, the viewing window is an opening. In otherembodiments, the window can be partially or completely closed using atransparent material that still allows viewing of the tablet computerscreen. In one aspect, the transparent material may be sufficiently thinas to allow substantial touch navigation on the screen interface therethrough.

As also shown in FIG. 3, the viewing window 52 may include a fasciaborder 54 that extends along one or more sides of the viewing window andintegrally connects and attaches to the side edges present in the firstpanel 10. The fascia can extend along a portion of the tablet computer'sviewing screen and may aid in retaining the tablet computer in the firstpanel and may fit snugly against the viewing window. In another aspect,the fascia may effectively frame the viewing window, and in some casesoverlap a bezel around the viewing window. Further, in some embodiments,a fascia piece may exist even where there is no corresponding firstpanel side edge. In this case, the fascia may attach to other fasciapieces and provide a bridge over the side edge opening through which thetablet computer slides to engage the first panel. Such a fascia piececan aid considerably in the retention of the tablet computer in thefirst panel.

In one aspect of the present invention, the tablet computer may beinserted through an open edge of the first panel and become completelyinserted when the inserted tablet end engages a side edge opposite theopening through which the tablet was inserted. The first panel may beconfigured in either a portrait or landscape orientation. In someembodiments, when in the landscape orientation, the open edge may be onthe left hand side of the first panel and the tablet computer engagesthe side edge on the right hand side of the first panel when it is fullyinserted. In other embodiments, the open edge may be at the top of thefirst panel. In this or other configuration, or in other configurations,the side edges of the first panel may include one or more small accessslots substantially matching the location of any input or outputmechanisms or ports on the tablet computer. Examples of such functionalfeatures to be accessed may include without limitation, buttons, pinconnectors, speakers, headphone jacks, dials, switches, or slide bars.In yet another embodiment, the opening into the first panel may be alonga top portion when the panel is in landscape orientation. Again, avariety of optional mechanisms may be used to close such an opening, ifdesired, after insertion of a tablet computer into the first panel, suchas a cap or other piece that friction fits onto the exposed edge of thetablet computer.

Referring again to FIG. 1, in some embodiments of the present invention,one or more of the first panel side edges may include a connector 55that is built into the and edge, including a side edge, and located at alocation substantially corresponding to an I/O or other port on thetablet device, and with which the connector will engage and communicate.One example is the 30 pin I/O port on the bottom of the IPAD®. In theembodiment where the IPAD slides into an opening on the left hand sideedge of a horizontally oriented first panel, a matching 30 pin I/Oconnector may be included at a corresponding location on the inside ofthe right side edge. As such, when the IPAD® fully engages the firstpanel by contacting the right side edge, the I/O port on the IPAD® willautomatically mate with the I/O connector on the right side edge. TheI/O connector is a component of the overall communication connector andfurther discussion of the connecting system will be provided hereafter.In alternative embodiments, the connector between the keyboard andtablet computer may be a wireless connection, such as a Bluetooth orother WiFi connection.

In addition to the foregoing, in some aspects, the first panel may haveother devices or accessories included therein. In one example, a camera,such as a video or web cam may be included in the fascia of one of theside edges of the first panel, or at another location such as the backside of the first panel. Further, in one embodiment, the first panel mayhave only fascia forming a frame around the front viewing window andalso on the back of the first panel. In this embodiment, the tabletcomputer engages the front and back fascia and is held in a friction fitthere between. In this embodiment, optionally, no side edges arenecessary or used. In yet another embodiment the first panel may have aback, and the front may be a fascia bordering the entire viewing screenand the fascia may be held to the back of the first panel with aplurality of individual connectors, such as posts, screws, bolts, etc.

The second panel of the tablet computer case of the present invention,may in some embodiments, weigh more than the weight of the first panelwith the tablet computer engaged therein. Such an embodiment canprevent, reduce, or minimize the incidence of device tipping, such asfalling or tipping over when the second panel is placed on a flatsurface with the first panel extended up at a 90° or greater angle, suchas when used like a traditional laptop computer. Alternatively, one ormore legs, posts, or segments, may be included in the first panel whichcan actuate to rest on a flat surface on which the tablet computer isplaced and thereby support and hold the first panel at an angledposition such as that of a traditional laptop, and prevent the devicefrom falling over.

In other embodiments of the present invention, the second panel mayweigh substantially the same, or less than the first panel with thetablet computer engaged therein. In some aspects, the second panel mayweight about equal with the first panel with the tablet computer engagedtherein. In an additional aspect, the second panel may weigh about 20%less than the weight of the first panel with the tablet engaged therein.In yet another aspect, the second panel may weigh about 10-70% less thanthe first panel with the tablet computer engaged therein. In a furtheraspect, the second panel may weigh about 50% less than the first panelwith the tablet computer engaged therein.

Referring now to FIG. 6, a perspective view is shown of a tabletcomputer case 100 having the first panel 10 and a second panel 14(keyboard not shown) connected by a hinge 56. In such embodiment, thetotal weight of the second panel can be selectively distributed among adistal third 58, a medial third 60, and proximal third 62 of the area ofthe second panel, where each location is named according to its locationwith respect to the hinge. In a particular embodiment, the total weightof the second panel is distributed in a pattern that increases in adirection from the proximal third of the second panel toward the distalthird. In some aspects, a disproportionate majority of the weight in thesecond panel can be in the distal third and medial third combined. Forexample, from 67% to 95% of the total weight of the second panel can belocated in the distal third and medial third combined. Alternatively,the majority of the total weight can be in one third of the second panelonly. In one example, greater than 50% of the total weight of the secondpanel is located in the distal third. In another example, greater than50% of the total weight of the second panel is located in the medialthird. In some cases the amount of weight placed in the distal thirdand/or the medial third, or the total weight distribution gradient orpattern between all areas of the second panel may be sufficient tosubstantially minimize or prevent the keyboard case from tipping whenthe first panel is placed at an obtuse angle with respect to a plane ofthe keyboard panel, even when the second panel as a whole weighs lessthan the first panel with the tablet computer engaged therein. In someaspects, the obtuse angle may be from about 91 degrees to about 160degrees. In another aspect, the obtuse angle may be about 120 degrees.In a further aspect, the obtuse angle may be from about 110 degrees toabout 140 degrees.

In other aspects, at least 15% of the total weight of the second panelmay be in the distal third 58 of the keyboard panel. In another aspectthe amount of weight may be from 20%-80%. In yet another aspect, theamount of weight may be at least 40% or at least 50%. In a furtheraspect, at least 40% of the weight of the second panel may be in thedistal third and medial third 60 of the second panel. In an additionalaspect the amount of weight in the first and second thirds may be from30% to 95% of the second panel. In yet another aspect, the amount ofweight may be at least 80% or 95% of the total weight of the secondpanel. In additional aspects of the invention, the weight gradient ofthe second panel may be customized to provide any gradient or pattern ofweight in the second panel that will allow the tablet case of thepresent invention to keep from tipping when the first panel is placed atan obtuse (i.e. 90 degree or greater angle) in relationship to the planeof the second panel all while the second panel weighs less than thefirst panel with the tablet computer engaged therein. Such weightprofiles, gradients, arrangements, and distributions may be achieved byplacing weights (i.e. a weight or mass with no function other than toprovide weight), or other components, such as those further describedbelow in specific locations required to provide the intended weightconfiguration.

It will be noted that a variety of components can be included in thesecond panel in addition to the keyboard. Such included components canadvantageously expand the overall capacity and functionality of thetablet computer and allow it to function much more like a laptopcomputer. Examples of components include without limitation, a powerinput, a power source, such as a battery, a memory module (i.e. harddrive), a readable or readable/writable disk component, such as a CD orDVD player, sound speakers, a mouse controller such as a touch pad orpoint stick, USB ports, SD ports, or other memory ports, as well as VGAor other output ports for outputting signal audio and video signal toadditional devices. For example, the memory module may increase the sizeof available memory, the battery may expand the battery life, and thepower input may allow the tablet computer to run on A/C power whileengaged in the case. One example is shown in FIG. 7, where a tabletcomputer case 100 includes a second panel 14, a transparent view ofwhich shows a CD ROM drive 64, a hard drive 66, and a battery 68installed therein. It is noted that this is one possible configuration,and that numerous other configurations and arrangements are possibleusing components suited for portable computing.

In accordance with an embodiment, such functional components can beutilized and specifically placed in the second panel in order to providethe weight distribution and configurations for the second panel asmentioned above. In addition, as shown in FIG. 8 at least one weight 69can be added that are non-functional components in order to aid inachieving a desired weight distribution. In another aspect as also shownin FIG. 8, one or more members 70 of a magnetic closure can be includedin the second panel and placed so as to aid in achieving a weightdistribution as well as in securing the case in a closed position. Forexample, magnetic closure can include a first member (e.g. a magnet) anda second member that is a magnetic element such as a piece of metal,where one member is located near an edge of the first panel and theother member is located in a distal edge of the second panel. Thisplacement allows the member in the second panel to engage with themember in the first panel to hold the case closed. In addition, the sameplacement of the member in the second panel can add weight to the distalportion of the second panel so as to aid in minimizing tipping when thecomputer case stands open for use as a laptop.

In yet an additional embodiment of the present invention, a hard drivein the second panel may include software that allows operation of amouse controller with the tablet computer or other manipulation ornavigation of the tablet computer. Such software may effectively work incombination with, or convert the touch navigation of the tabletcomputer, to allow mouse and keyboard based navigation in place of, orin addition to, the touch based navigation. Further, such software mayprovide an overlay or mask on the touch based operating system whicheffectively converts the touch based operating system to a traditionalcomputing operating system, such as the MAC OSX, Microsoft Windows®,etc. The conversion of the operating system may be a true conversion ofthe system, or may be a mask or overlay only where the graphical userinterface appears like a non-touch navigation system, but actualcomputing function remains within the touch based navigation systemprotocols. Such a mask would effectively allow the user to control thetablet computer in the manner of a traditional operating system withkeyboard and mouse inputs, while the actual inner workings of the tabletcomputer remain unchanged from the original touch navigation system.

The keyboard of the second panel can be of any design or layout asrequired to meet a specific need. Text keys, function keys, programmablekeys, etc. can be included. In one aspect, the keyboard can be fullsized or a small size that is sufficient to still allow typing with bothhands simultaneously in a traditional fashion. In another aspect, suchas when the tablet computer is a cell phone or smaller device, thekeyboard may be a QWERTY keyboard or other keyboard of appropriate sizeto allow operation with individual fingers or thumbs of one or bothhands. Moreover, the keys may protrude from the panel to a specificallydesired height, be flat or flush with the panel, or may be retractedinto the panel automatically upon articulation of the second panel intoa position behind the first panel.

The first and second panels of the case are connected by at least onehinge. In one embodiment, the hinge engages a bottom edge of the firstpanel and connects the first panel to a back edge of the second panel.Thus connected, the first and second panels can be positioned withrespect to one another in a variety of specific configurations. At oneextreme, the hinge allows the first and second panels to pivot into aposition where the viewing screen of the tablet computer and thekeyboard come together and face one another. In some aspects, thekeyboard may touch, or nearly touch the viewing screen of the tabletcomputer when the panels close on one another and come together. Atanother extreme, the hinge allows the first and second panels to pivotinto a position where the viewing screen and the keyboard move apart andface substantially away from one another. This includes facing inopposite directions. In this position, the back of the first panel andthe back of the second panel may come together and touch one another. Insome embodiments, the backs of each panel may substantially contact oneanother along multiple points of their surfaces. In this second extremeposition, the first and second panels are rotated substantially 360°from the first position wherein they are facing and nearly touching oneanother. Moreover, the hinge may be spring loaded or otherwise tensionedso as to allow the first panel to maintain a fixed position at nearlyany specifically desired angle of orientation within its 360° rotationwith respect to the second panel. As shown in FIGS. 9 through 14, suchfreedom of rotation allows a plurality of positions providing differingmodes of accessibility to the viewing screen 36 of the tablet computer.As shown in FIG. 9, a first position (“tablet position”) is when thefirst panel 10 and second panel 14 are closed in a back-to-backconfiguration with the view screen and keyboard (not shown) facing inopposite directions of one another. In this orientation, the viewingscreen of the tablet computer may be viewed and used as a tablet withtouch interface, etc. A second position of accessibility (“displayposition”) is obtained when the first panel is moved to a position thatis 90° or less from the first position, as shown in FIG. 10. In thisorientation, the keyboard remains facing down in an inaccessibleposition, but the screen is now tilted up from the original flatorientation to an angled orientation. With this angled viewingorientation, the viewing screen may be conveniently viewed for manyactivities, such as watching a movie, presenting a video presentation toan audience, or further navigating the touch screen interface of thetablet computer. A third position of accessibility (“laptop position”)may be obtained when the first panel is further actuated away from thefirst and second position as shown successively in FIGS. 11 and 12, towhere the keyboard of the second panel faces up and is usable by a userand the viewing screen is positioned at a 90° or greater angle withrespect to the keyboard side of the second panel. Such a position placesthe device in a configuration that is like that of a traditional laptopcomputer where the keyboard can be used by a user while the usersimultaneously views the viewing screen. Finally, the rotation of thepanels past the third position into a fourth and final position, asshown successively in FIGS. 13 and 14, where the device closes with thescreen of the tablet computer and keyboard substantially opposing oneanother in an opposing manner (“closed position”) may be used forstorage when the device is not in use. Such orientation allows forprotection of both the touch screen of the tablet computer and thekeyboard in the second panel.

In addition to the weight distribution and design of the second panel asdescribed above, the tablet computer case of the present invention canutilize specific hinge configurations in order to allow reduction and/orcontrol of the weight of the second panel while preventing the devicefrom tipping when used in a laptop configuration with the first panel atan obtuse angle with respect to the second panel. Referring now to FIGS.15 and 16 in which is shown a cross section of a hinge 56 attaching thefirst panel 10 and second panel 14 of the present case together. A sideview thereof is shown in FIGS. 17 and 18. As can be seen in FIGS. 15 and16, the hinge is a double hinge with dual action having a firstrotational axis 72 adjacent to the bottom edge 74 of the first panel anda second rotational axis 76 adjacent to the back edge 78 of the secondpanel. It should be noted that the terms “bottom edge of the firstpanel” and “back edge of the second panel” as used in this way refer tothe locations of these edges relative to their respective panels whenthe case is in a laptop position. Other terms could be applied todescribe the location of these particular edges in other positions froma user's point of view. However, to preserve clarity and continuity inthe following discussion, the terms “bottom edge of the first panel” and“back edge of the second panel” are used herein to refer to the edgesattached to the hinge regardless of case position.

Each rotational axis allows the respective panel to rotate up to 180degrees and collectively allow a panel to rotate effectively 360degrees. As also shown in FIGS. 15 through 18, the case of the presentinvention is oriented with the underside 80 of second panel 14 restingon a horizontal surface 82 and defining a plane. As used herein inreference to the second panel, the term “underside” refers to thesurface as well as any other features associated therewith (e.g. feet),that support the tablet computer case through contact with an underlyingsurface. The first panel 10 is angled as the case is in the act ofrotating from a closed position to an open position. In one aspect ofthe present invention, the hinge 56 may be configured with a greatertension about the first rotational axis 72 than the second rotationalaxis 76. As shown in FIG. 15, with greater tension in the firstrotational axis, the second rotational axis is caused to initiallyactuate upon opening the case from a closed position where the tabletcomputer and keyboard face one another in an opposing manner. With thesecond axis engaging in initial rotation, the angle of the hinge withrespect to the first panel remains acute or at substantially 90° whilethe first panel moves, and until the bottom edge 74 comes to rest in thesame plane (i.e. on the same surface 82), or substantially the sameplane, as that of the second panel. With the edge of the first panelresting on such surface, a portion of the weight of the first panelrests on the surface and reduces the amount of weight required of thesecond panel in order to reduce, minimize, or prevent an incidence oftipping of the case as recited above.

The tension differences between the first rotational axis and the secondrotational axis in the hinge may be set at any combination that allowsfor smooth and fluid operation of the device from a closed position toan open position with the screen in viewable orientation with keyboardexposed for use (i.e. laptop orientation). However, in one aspect, thetension of the first rotational axis may be about 10% greater than thetension on the second rotational axis. In yet another aspect, thetension of the first may be about 20% greater than the second. In anadditional aspect, the tension of the first may be from 30% to 400%greater than the tension of the second. In a particular example of thisaspect, the tension of the first is from 50% to 300% greater than thetension of the second. In another example, the tension of the first isfrom 70% to 200% greater than the tension of the second. In otherexamples, the first rotational axis can have tension that is greater by30% to 100%, or 80% to 100%, or 50% to 400%, or 50% to 200%, or 100% to400%, or 30% to 70%. As can be seen in FIGS. 9 through 14, furtherrotation of the first panel 10 and second panel 14 with respect to oneanother is enabled by continued rotation of the second axis and bycommencing rotation of the first axis. Such rotation allows movement ofthe panels into all of the positions enumerated above.

In accordance with the concepts discussed herein, methods of adding akeyboard to a tablet computer and making a tablet computer case thataccomplishes such an addition can comprise configuring and attachment ofthe elements described. More specifically, the concepts and innovationsdiscussed herein are applicable to a method of adding a keyboard to atablet computer, a method of minimizing tipping in a tablet computercase, and a method of making a tablet computer case with enhancedstability. In particular, such methods can comprise configuring a firstpanel to hold the tablet computer and attaching the first panel by wayof a hinge to a second panel having a keyboard. As discussed above, thehinge, and/or keyboard weight can be configured so as to reduce orminimize tipping (i.e. improve or maximize stability) of the tabletcomputer case, particularly when employed in a laptop position (i.e.with the screen in viewable orientation with keyboard exposed for use).In accordance with the present invention, any one or more of these hingeconfigurations and action may be used in making the inventive case withenhanced stability and in minimizing tipping of such a case.Furthermore, any one of the weight schemes for the second panel asrecited above can be used either by itself, or in connection with any ofthe hinge configurations, in order to provide this stability. The weightschemes can further allow reduction of the overall weight of the secondpanel, and therefore reduction of its thickness and reduction of theweight and size of the overall device. Accordingly, the thickness of thesecond panel and/or the first panel can be varied in order to provide adesired effect.

Thickness and weight are typically of great concern in personalelectronics. In one aspect, the greatest thickness of the second panelcan be less than a greatest thickness of the first panel. In oneexample, the greatest thickness of the second panel is from about 20% toabout 80% of the greatest thickness of the first panel. In anotherexample, the greatest thickness of the second panel is from about 30% toabout 50% of the greatest thickness of the first panel. In still otherexamples, the greatest thickness of the second panel is from 30% to 40%,or from 20% to 40%, or from 40% to 60%, or from 50% to 80% of thegreatest thickness of the first panel. In another aspect, the secondpanel can have a greatest thickness of from about 4.0 mm to about 10.0mm. In a particular example, the greatest thickness of the second panelis from about 5.0 mm to about 7.0 cm. In another example, the greatestthickness of the second panel is from about 6.0 mm to about 9.0 cm.

In addition to a hinge as described above, the tablet computer case ofthe present invention may utilize instead a ball hinge, a post hinge, orother hinge which allows the first panel to rotate in a circulardirection in substantially the same plane as the second panel. In suchan embodiment, the panels may be oriented into a first position wherethe viewing screen and keyboard face one another and the panels areclosed together. A post hinge or other type of pivoting device can belocated substantially in the middle of the back edge of the second paneland the bottom edge of the first panel connecting the two at that singlehinge point. Next, the first panel may be rotated in either a clockwiseor a counter clockwise direction for 180° and raised up so that it nowis moved into a second position of accessibility with the keyboard ofthe second panel facing up and being usable, and the view screen facingaway from the keyboard and the first panel forming a 90° or less withrespect to the second panel. Finally, the first panel can be folded flatinto the first position of accessibility where the first and secondpanels are flat against one another and the viewing screen can be viewedand the tablet computer used as a tablet. In this case, however, theviewing screen and keyboard will face the same direction, though thekeyboard will not be usable as it is covered by the first panel.

In another embodiment, a tablet computer case of the present inventioncan comprise a first panel configured to releasably hold a tabletcomputer, and further a keyboard that is permanently attached to thefirst panel. In one aspect, such a case can also utilize a ball hinge, apost hinge, or other hinge which allows the first panel to rotate in acircular direction relative to the keyboard. Alternatively, the keyboardcan be attached by a slider mechanism that allows the keyboard to slideout and pivot to a laptop position or slide behind the first panel orinto a compartment when not in use. These and other permanentattachments are also contemplated for use with hinge configurationsand/or weight distributions discussed herein to minimize or reducetipping (i.e. improve or maximize stability) in a laptop position.

As shown in FIGS. 17 and 18, the hinge 56 can also be configured so thata part of the hinge provides a foot structure 82, where when the tabletcomputer case is opened into a laptop position on a surface 80, the footstructure contacts the surface and at least partially supports the case.In addition, the location of the hinge and foot structure can alsoresult in the second panel being raised at an angle relative to thesurface, and in some embodiments may further aid in improving/maximizingstability and reducing/minimizing tipping. Consequently, the keyboard isalso presented to a user at an angle that can enhance keyboardvisibility and increase user comfort when using the keyboard.

A wide variety of additional movements and articulations are possiblewith the case of the present invention in order to provide desiredaccessibility and function. It is to be noted that in some embodiments,when the first and second panel are brought together, or when thekeyboard is inaccessible by the user because it is either covered by thefirst panel, or faces in a direction away from the viewing screen, thatthe keyboard can be disabled to prevent inadvertent activation thereofor input into the tablet computer. This deactivation can be automaticand occur when the viewing screen and keyboard move outside a specificrange of orientations for one another, or can be manually made tohappen. In an additional embodiment of the invention a sliding cover maybe included in the second panel that hides or otherwise blocks the keysfrom being touched or used. Such a panel can have a simple lip thereonor other mechanism for grasping or purchasing the panel to move it froman open position to a closed position or visa versa.

Referring again to FIGS. 17 and 18, in one embodiment the second panel14 can also include one or more spacers 86 attached on the keyboard side16 or surface. Such spacers can be configured and located to serve aplurality of functions. In one aspect, the one or more spacers can serveto separate the keyboard surface from the first panel 10 in a closedposition. This arrangement can protect the keyboard and/or the tabletcomputer from any wear or damage that could arise from repeated contactwith the second panel or portions thereof. In addition, the spacers, cancontribute to maintaining a particular overall profile of the closedcase based on the dimensions of the panels and the hinge 56. In anotheraspect, the one or more spacers can stably support the tablet computercase on a surface in a position where the keyboard side is facing downtoward the surface, e.g. a display position. In addition to providingstability to the case and the computer in such a position, the spacersalso serve to protect the keyboard from contact with the surface.

The configuration and number of the spacers can be selected so as toadequately provide the above functions. Accordingly, in one embodimentat least one spacer is attached to the keyboard side or surface of thesecond panel. In a more particular embodiment, at least two spacers areso attached. In a still more particular embodiment, at least fourspacers are so attached. The spacers can have a variety of shapes andsizes. In one aspect, the spacers may be round. In another aspect theymay be elongated. In a further aspect, they may be square. Other shapesare also possible, such as oblong, curved, flat, domed, ribbed, etc. Inone aspect, the one or more spacers have a thickness that provides aparticular spacing in one or more case positions. In a particularexample, the spacer has a thickness of from about 1/16 inch to about 1/2inch. The arrangement of the spacers can also be selected so as to servethe above functions. For example, a spacer can be located centrallyrelative to an edge of the keyboard side. Alternatively a spacer can belocated at a corner of the keyboard side. In one aspect, a spacer isremovably attached, such as with a releasable adhesive, allowing thespacer to be placed in a desired location.

In addition to the foregoing, a variety of other mechanisms may be usedin connection with the hinge configurations of the present case. Forexample, slide tracks may be used to allow the first panel to slide overthe top of the second panel while both keyboard and viewing screen facethe same direction. Once the first panel is slid out away from thesecond panel to expose the keyboard, the hinges may engage to allowpivoting of the first panel up into a position that is viewable by auser while using the keyboard, such as between 175° and 60° with respectto the keyboard surface.

The communication connector can in some embodiments include an I/Oconnector that is fixed on an inside edge of the first panel and whichis aligned with an I/O port on the tablet computer. A single I/Oconnector and port may be used, or multiple. A wide variety of designsand systems may be utilized in order to accommodate the specificrequirements of a given tablet computer. In one aspect, an access slotmay be provided on the edge of the first panel at the location of thetablet computer's I/O port(s) and a suitable I/O connecter utilized andextended there through. The I/O connector used in the first panel willthen be connected to the hardware devices provided in the second panelin order to allow sufficient communication from those devices to thetablet computer. Those of ordinary skill in the art will recognizesuitable cords, cables, connectors, wires, and lines for such purpose.

The case of the present invention may further utilize a mechanism forkeeping the first and second panels retained together when the device isin a closed orientation as reference above. Clasps or latches may beused in one embodiment. In an additional embodiment magnets may bepositioned at specific locations along the one or more outer edges ofthe second panel and a corresponding magnet or metal strip in the firstpanel which will be attracted to the magnet(s) in the second panel. Anumber of magnet-magnet or magnet-metal strip configurations can beused. In one embodiment as shown in FIGS. 3 and 8, metal strips 88 maybe placed in or behind the fascia segments of the first panel withcorresponding magnets 70 residing along the outer edges either inside oroutside of the second panel. Thus when the panels are brought togetherin a closed orientation, the panels will remain together due at least inpart to the attractive force between the magnet and the metal strips. Itis noted that the tensions in the first rotational axis of the hinge mayalso aid in keeping the case closed and can be utilized in combinationwith the amount of force provided by the magnetic closure mechanisms.The magnets may serve an additional purpose of turning the tabletcomputer off and on when tablet computers with a magnet actuated on andoff switch are used with the case of the present invention, such as theswitch used in the tablet computer sold by Apple under the brand iPad 2.

The materials used in the fabrication of the case of the presentinvention may include any suitable materials required to achieve a givenpurpose. Examples of suitable materials include without limitationpolymer and plastics, metals and alloys, and ceramics. Those of ordinaryskill in the art will recognize materials suitable for the varyingcomponents in order to obtain desired function.

The foregoing detailed description describes the invention withreference to specific exemplary embodiments. However, it will beappreciated that various modifications and changes can be made withoutdeparting from the scope of the present invention as set forth in theappended claims. The detailed description and accompanying drawings areto be regarded as merely illustrative, rather than as restrictive, andall such modifications or changes, if any, are intended to fall withinthe scope of the present invention as described and set forth herein.

What is claimed is:
 1. A tablet computer case comprising: a first panelconfigured to releasably engage and hold a tablet computer of apredetermined size and shape; at least one side edge which engages anedge of the tablet computer, and a fascia that extends along a portionof a visual output side of the tablet computer and that is integral withthe at least one side edge; a second panel having a keyboard side onwhich a keyboard is located; a communication connector that allows thekeyboard to communicate with the tablet computer; a hinge rotatablyattaching the first panel and the second panel; and wherein the hingeengages a bottom edge of the first panel and connects the first panel toa back edge of the second panel, and is configured to allow the firstpanel to swing over a range of about 360° relative to the second panel,and wherein the hinge has a sufficient tension to hold the first paneland the second panel at substantially all positions of the first panelrelative to the second panel within the range; and wherein the hingecomprises a first rotational axis adjacent to a bottom edge of the firstpanel and a second rotational axis adjacent to a back edge of the secondpanel, and wherein the hinge is configured so that the bottom edge ofthe first panel can rest in substantially a same plane as an undersideof the second panel and a portion of the hinge when the first panel isat an angle of at least about 90° with respect to the second panel;wherein the second panel weighs less than a weight of the first panelwith the tablet computer engaged therein.
 2. The tablet computer case ofclaim 1, wherein the first panel has a back member that engages a backof the tablet computer, at least one side edge which engages an edge ofthe tablet computer, and a front with a viewing window for viewing ascreen of the tablet computer.
 3. The tablet computer case of claim 2,further comprising a plurality of side edges which engage the edges ofthe tablet computer.
 4. The tablet computer case of claim 3, wherein theplurality of side edges engage at least three edges of the tabletcomputer.
 5. The tablet computer case of claim 4, wherein the tabletcomputer slidably engages the first panel through an open edge betweentwo of the three edges, and wherein an edge opposite the open edgesubstantially contacts an edge of the tablet computer when the tabletcomputer is fully engaged with the first panel.
 6. The tablet computercase of claim 5, further comprising a separate panel piece configured toattach to the first panel and fit around an exposed edge of the tabletcomputer.
 7. The table computer case of claim 3, wherein at least one ofthe side edges has an access slot matching a location of inputs oroutputs on one of the edges of the tablet computer and providing accessthereto.
 8. The tablet computer case of claim 1, wherein thecommunication connector is a wireless connector.
 9. The tablet computercase of claim 1, wherein the second panel further includes at least onemember selected from the group consisting of: a power input, a powersource, a memory module, a readable disk component, sound speakers, amouse controller, or a combination thereof.
 10. The tablet computer caseof claim 1, wherein the positions include a closed position wherein thefirst and second panels are brought together with the keyboard andtablet computer viewing screen facing one another when a tablet computeris inserted in the first panel.
 11. The tablet computer case of claim 1,wherein the positions include a laptop position in which the first panelis substantially upright and the keyboard side is facing upwardly. 12.The tablet computer case of claim 1, wherein the positions include adisplay position in which the first panel is substantially upright andthe keyboard side is facing downwardly.
 13. The tablet computer case ofclaim 1, wherein the positions include a tablet position where theviewing screen of the tablet computer and the keyboard face insubstantially opposite directions from one another.
 14. The tabletcomputer case of claim 10, further including a magnetic closure to aidin holding the first panel and the second panel in the closed position.15. The tablet computer case of claim 14, wherein the magnetic closurecomprises a magnet located on the second panel and a correspondingmagnetic member on the first panel.
 16. The tablet computer case ofclaim 15, wherein the magnetic member is one of a magnet or a metalstrip.
 17. The tablet computer case of claim 1, wherein the hingeincludes a foot for at least partially supporting the tablet computercase above an underlying surface.
 18. The tablet computer case of claim17, wherein the foot raises the second panel so that the keyboard restsat an angle relative to the underlying surface.